Works for the pixelfoo apps.
Limitations:
- Resizing the window is buggy.
- The frame rate argument has no effect.
- The update and render event logic should be reworked.
- Supports only single file executables, not interpreters with args
(e.g. running an app as "python3 app.py" is not supported)
- Supports only RGB, not RGBW (yet)
